"A private helicopter carrying a wedding party landed by mistake inside a high security prison on Thursday, sparking massive security concerns amid reports that terrorists were planning an attack on the jail to free the militant inmates."

"According to the officials the guards at Kashimpur Central Jail detained the five passengers, all members of an expatriate Bangladeshi family, for a brief period but the pilot, reportedly a retired air force officer, flew away with the plane after sensing his mistake."

I think that was the "dress rehearsal". It happened in Greece some years ago (2009). The prisoner managed to escape and the pilot was under the threat of a gun. Beautiful helicopter by the way. The next day a newspaper published a picture of an airport screen that showed the departures and arrivals of the convict's airline.